GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 22 Jan 2019, 23:20

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

## Events & Promotions

###### Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
• ### The winners of the GMAT game show

January 22, 2019

January 22, 2019

10:00 PM PST

11:00 PM PST

In case you didn’t notice, we recently held the 1st ever GMAT game show and it was awesome! See who won a full GMAT course, and register to the next one.
• ### Key Strategies to Master GMAT SC

January 26, 2019

January 26, 2019

07:00 AM PST

09:00 AM PST

Attend this webinar to learn how to leverage Meaning and Logic to solve the most challenging Sentence Correction Questions.

# If n is a positive integer, the sum of the integers from 1 to n, inclu

Author Message
TAGS:

### Hide Tags

Senior PS Moderator
Joined: 26 Feb 2016
Posts: 3334
Location: India
GPA: 3.12
If n is a positive integer, the sum of the integers from 1 to n, inclu  [#permalink]

### Show Tags

Updated on: 30 Oct 2018, 00:12
00:00

Difficulty:

15% (low)

Question Stats:

78% (01:01) correct 22% (01:33) wrong based on 32 sessions

### HideShow timer Statistics

If n is a positive integer, the sum of the integers from 1 to n, inclusive, equals $$\frac{(n(n+1))}{2}$$ Which of the following equals the sum of the integers from 1 to 2n, inclusive?

A. $$n(n+1)$$

B. $$\frac{(n(2n+1))}{2}$$

C. $$n(2n+1)$$

D. $$2n(n+1)$$

E. $$2n(2n+1)$$

_________________

You've got what it takes, but it will take everything you've got

Originally posted by pushpitkc on 30 Oct 2018, 00:08.
Last edited by Bunuel on 30 Oct 2018, 00:12, edited 1 time in total.
Edited the question.
CEO
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2726
Location: India
GMAT: INSIGHT
Schools: Darden '21
WE: Education (Education)
Re: If n is a positive integer, the sum of the integers from 1 to n, inclu  [#permalink]

### Show Tags

30 Oct 2018, 00:29
pushpitkc wrote:
If n is a positive integer, the sum of the integers from 1 to n, inclusive, equals $$\frac{(n(n+1))}{2}$$ Which of the following equals the sum of the integers from 1 to 2n, inclusive?

A. $$n(n+1)$$

B. $$\frac{(n(2n+1))}{2}$$

C. $$n(2n+1)$$

D. $$2n(n+1)$$

E. $$2n(2n+1)$$

sum of the integers from 1 to n, inclusive, equals $$\frac{(n(n+1))}{2}$$

Replacing $$n$$ by $$2n$$

sum of the integers from 1 to $$2n$$, inclusive, equals $$\frac{(2n(2n+1))}{2} = n(2n+1)$$

_________________

Prosper!!!
GMATinsight
Bhoopendra Singh and Dr.Sushma Jha
e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi
http://www.GMATinsight.com/testimonials.html

ACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION

Re: If n is a positive integer, the sum of the integers from 1 to n, inclu &nbs [#permalink] 30 Oct 2018, 00:29
Display posts from previous: Sort by